Robert Milkowski writes:
> Hello Roch,
>
> Monday, May 15, 2006, 3:23:14 PM, you wrote:
>
> RBPE> The question put forth is whether the ZFS 128K blocksize is sufficient
> RBPE> to saturate a regular disk. There is great body of evidence that shows
> RBPE> that the bigger the write sizes and matching large FS clustersize lead
> RBPE> to more throughput. The counter point is that ZFS schedules it's I/O
> RBPE> like nothing else seen before and manages to sature a single disk
> RBPE> using enough concurrent 128K I/O.
>
> Nevertheless I get much more throughput using UFS and writing with
> large block than using ZFS on the same disk. And the difference is
> actually quite big in favor of UFS.
>
Absolutely. Isn't this issue though ?
6415647 Sequential writing is jumping
We will have to fix this to allow dd to get more throughput.
I'm pretty sure the fix won't need to increase the
blocksize though.
I'll be picking up this thread again I hope next week. I have lots
of homework to do to respond properly.
-r
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